This is the 4763rd most frequent German word.
zwingend
Mandatory; compelling; imperative.
Used to indicate an absolute necessity or obligation.
Es ist zwingend erforderlich, dass du das Formular ausfüllst.
It is absolutely essential that you complete the form.
Explains that a matter is not compulsory but recommended.
Ihre Teilnahme an der Besprechung ist nicht zwingend, aber sehr wünschenswert.
Your attendance at the meeting is not mandatory, but highly desirable.
Describes something as convincing or logically unavoidable.